Design, synthesis, characterization and electrocatalytic behaviour of a dinuclear palladium(I) complex supported by 1-[(2-chloro)benzene]-3-[(2-carboxmethyl)benzene]triazenide ions

Abstract

In the presence of HCl, the reaction of 2-chloroaniline, methyl anthranilate and sodium nitrite formed 1-[(2-chloro)benzene]-3-[(2-carboxymethyl)benzene]triazene (HL). In the presence of triethylamine (Et3N), the reaction of HL and [Pd(CH3CN)2]Cl2 gave a new dinuclear triazenido complex, [PdI2(L)2] with metal–metal bond, which has been characterized by physico-chemical and spectroscopic methods. The irradiation by a 100-W high-pressure mercury lamp led to a cleavage of the Pd-Pd bond in [PdI2(L)2]. Electrochemical studies showed that [PdI2(L)2] can electro-catalyze hydrogen evolution both from acetic acid and water. Spectroscopic investigations indicated that the introduction of palladium ion leads the strength of photoluminescence of HL to a significant decrease.